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TPS54228: Why EN pin must be pulled up on TPS54228?

Part Number: TPS54228

Hi,

According to datasheet P,3, EN is active high and must be pulled up to enable the device.  Could you please explain the reason why EN pin must be pulled up?

My customer wants to connect Vdd directly, because board size is tight and he wants to reduce pull-up resistor.  So please advise us.

Thanks and best regards,
M.HATTORI.